Patents by Inventor Hisayo Ishio

Hisayo Ishio has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Dichroic azo dye, liquid crystal composition containing the same, and liquid crystal element using the composition
    Patent number: 5536818
    Abstract: A dichroic dye represented by the formula (I) or (II): ##STR1## wherein the substituents are as described in the specification. The dichroic dyes (I) and (II) exhibit excellent dichroism and can be prepared from 2,2'-ditrifluoromethylbenzidine having no toxicity, such as mutagenicity.
    Type: Grant
    Filed: November 4, 1994
    Date of Patent: July 16, 1996
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Masaharu Kaneko, Hisayo Ishio